A rough running motor or lack of power can be caused by a failed distributor cap or rotor, ignition wires (or their resistors), or valve cover gasket leaks. If the valve cover gasket leaks, oil can pool where the ignition wire resistor connects to the spark plug. The resistor can fail and the spark plug may not fire because of a short circuit through the oil.

I own a Mercedes Benz 300e that I bought for my wife for $1700. At that point it had 249,000 miles on it. Before we owned it, it had been sitting for some years and had a acceleration delay issue. Once we got it back on the road I added fuel injector cleaner and drove it hard on the highway. Now the issue only appears before its fully warmed up to operating temperature. She did not want it bac...

I've had my 92' 300E with the 3 liter engine for close to 15 years now and it now has 248,000 miles on it. I’ve only had the standard repairs to perform for a car of this age (radiator, alternator, belts) all self repaired/replaced. The only small annoyance is the need to add oil, about 2 quarts/month, but I've accepted it. The car still runs strong and rides well. It’s getting close to time fo...

Car is very dependable when it's running. Strong engine at 170K miles, but I do find that it has a problem with the air conditioner sometimes blowing and sometimes not. It happens quite frequently. I also have noticed that it leaks transmission fluid if it sits for more than a week or so. Those are the two problems that I have encountered with this vehicle at this juncture. I love the way ...